1. On-site cardiopulmonary resuscitation is mainly divided into three steps, namely, airway opening, artificial respiration and chest compressions. First of all, we must judge the patient's consciousness. Call him loudly, see if there is any reaction and breathing. Touch his carotid artery to see if it beats. Don't touch two carotid arteries at the same time, which is prone to danger.

2. If the patient has cardiac arrest and loses consciousness, then the muscles of the patient's whole body will become slack, and the tongue muscles in the mouth will also become slack, and the tongue base will shrink back, which will lead to respiratory obstruction and respiratory obstruction. Therefore, before mouth-to-mouth blowing, be sure to open the airway and keep it unobstructed.

3, artificial respiration, that is, mouth-to-mouth blowing, which is an effective way to provide air to patients. The operator puts his hand on the patient's forehead, fixes the patient's head, holds the patient's nostril with his thumb and forefinger to prevent the blown gas from overflowing, takes a deep breath, tries his best to open his mouth close to the patient's mouth to form an airtight sealing state, and blows hard until the patient can breathe spontaneously.